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308 Industrial Park Road
Starkville, MS 39759
(662) 323-9538 Fax: (662) 323-5803
INSTRUCTION MANUAL
General Description
The Hy-Gain 18AVQII is an omni-directional, vertical radiator that operates on the 10,
15, 20, 40, and 80 meter amateur bands. The system will work against earth ground or a
resonant radial system when mounted above ground. You can make your own radial
system following the manual, or use the Hy-Gain 14RMQ Radial System Kit available at
your Hy-Gain dealer.
The antenna can be used for either Phone or CW with either a ground or roof mount. It
can also be tuned to mid-band for use with either Phone or CW. In either case, the SWR
bandwidths of the antenna are broad enough that the antenna will operate at an SWR of
2:1 or less on the 10, 15, 20, and 40 meter bands. The antenna will radiate on the 80
meter band with a limited bandwidth. The 18AVQII is supplied with stainless steel
hardware and element clamps for all electrical and most mechanical connections.
Theory of Operation
The use of heavy duty "Hy-Q Traps" provides automatic band selection. The Hy-Q Traps
are parallel resonant circuits which isolate the various sections of the antenna and give
quarter wavelength resonance on all bands. The top loading coil is used for operation on
the 80 meter band while the overall height of the antenna remains less than 20 feet.
WARNING:
When installing your antenna, take extreme care to avoid any accidental
contact with power lines or overhead obstructions. Failure to exercise this care could
result in serious or fatal injury.
NOTE: If the terminals of the input connector are checked with an ohmmeter, they will
show a direct short. This is normal! The matching coil in the antenna base puts the entire
system at DC ground, but presents a 50 ohm load impedance to RF energy.
Choosing a Site
The 18AVQII can be mounted on the ground, on a rooftop, or on a mast. The antenna
should be secured using non-conducting guy ropes if the 80 meter loading coil is
installed. When choosing an installation site be sure to allow sufficient space for these
guy ropes.
Model 18AVQII
Five Band Vertical Antenna
10, 15, 20, 40, 80 Meter
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Related Manuals for Hy-Gain 18AVQII
Summary of Contents for Hy-Gain 18AVQII
- Page 1 DC ground, but presents a 50 ohm load impedance to RF energy. Choosing a Site The 18AVQII can be mounted on the ground, on a rooftop, or on a mast. The antenna should be secured using non-conducting guy ropes if the 80 meter loading coil is installed.
- Page 2 Installation of Radials There is no need to make radials exactly ¼ wavelength long for the 18AVQII. In fact, the only case where you should have ¼ wavelength radials would be for approximately 90 radials.
- Page 3 11’ 4” 33’ 133’ 16’ 6” 8’ 4” 8’ 4” 16’ 6” 11’ 4” 133’ 33’ Figure 1 Optimum Radial Lengths, Dimensions from Base to Insulator Assembly and Installation Before you begin, read the instructions and study the illustrations. Compare the parts against the Parts List at the end of this manual.
- Page 4 CAPACITACE SPOKES 80 METER LOADING COIL 40 M ETER CAPACITACE SPOKES Item No. Description Base Assembly, 18AVQII (Ground Mount) Tube, M, 1 1/4” x 48” slotted Insulator, upper 16-20-23 Tube, M2, 1 1/8” X 52” Tube, M3, 1” x 8”...
- Page 5 Tubing Select the proper size tube clamps as shown in the chart. When installing the clamps, place the clamp near the tube end with the top of the clamp over the slot in the tube as shown in Figure 2. After adjustment of the tubing lengths, tighten the clamp with a 5/16 inch nut driver, socket, or open end wrench until the tubing will not twist or telescope.
- Page 6 CAUTION: All of the antenna dimensions must be set on the mode chosen - all CW, all mid-band or all phone. Mixing dimensions in an attempt to improve another mode on certain bands will only degrade performance on all bands. Refer to Figure 2 in assembling the main portion of the antenna.
- Page 7 Top Loading Coil Assembly 1. Remove the loading coil parts from the separate packaging. Check to see that each is present using the packing list at the end of this instruction manual. 2. Place a 4-40 screw in each of the 16 holes on the capacitance spoke rings and secure them using a 4-40-kep nut.
- Page 8 Installing the Antenna Refer to the mounting details in Figure 4 and 5 to install the completely assembled antenna. Figure 5 Antenna Installation First mount the completed antenna on your mast (not supplied) as shown in Figure 5. Use the two U-bolts, 5/16" nuts and 5/16" lock washers (Items Nos. 29, 31 and 30). Use three (3) 1/4"-20 x 3/4"...
- Page 9 NOTE: If your antenna is mounted more than three feet above ground, a resonant system must be added for proper operation. The radial system can serve to guy the system if insulators are used at the proper lengths shown. This system must be grounded for lightning protection. Connect a ground wire to one U-bolt on the antenna base and run it to a buried, 8 foot (250 cm) ground rod by the shortest route.
- Page 10 Figure 7 Hooking Up the Antenna 1. Connect your coax (RG-213/U) to the SO-239 connector at the bottom of the mounting bracket. (Coax not supplied.) Weather seal the coax connection with Coax- Seal© or an equivalent to prevent moisture from shorting out the connection. Final Adjustment (Optional Fine Tuning Of Your Installation) 2.
- Page 11 Lightning Protection For maximum lightning protection, we recommend the use of a Hy-Gain LA-1 Lightning Arrestor, available from your Hy-Gain dealer. Your antenna is now ready to use. Figure 8...
- Page 12 U-Bolt, 5/16" x 15/8"x 21/4" 564792 Lockwasher, split 5/16 555747 Nut, hex, 5/16"-18 80 Meter Loading Coil Assembly Parts List 190315 Tube 1 1/8" x 20" SW 18avqii-1 Loading Coil Assembly 810-0640- 36" spokes 872016 Parts Pack 656- 0375S 6-32" x 3/8"...
- Page 13 Warrants to the original owner of this product, if manufactured by hy-gain and purchased from an authorized dealer or directly from hy-gain to be free from defects in material and workmanship for a period of 12 months for rotator products and 24 months for antenna products from date of purchase provided the following terms of this warranty satisfied.
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